Key Tax Dates in the UK for self-assessment

Key HMRC Dates Every Online Seller Should Know

When you’re busy selling on eBay, Vinted, Etsy or Amazon, it’s easy to lose track of the important tax deadlines.

Here’s a quick guide to the key dates HMRC expects you to know — and how to stay organised so none of them sneak up on you.

6 April – The New Tax Year Starts

Every UK tax year runs from 6 April to 5 April.That means all your sales and expenses between those dates count as one year’s trading activity.

Example: Anything you sell between 6 April 2024 and 5 April 2025 will be included in your 2024/25 tax return.

5 October – Register for Self Assessment

If your total trading income (not profit) for the year is over £1,000, you should register with HMRC by 5 October following the end of that tax year. This gives HMRC time to set up your account before you file.You can register online at gov.uk/register-for-self-assessment.

Don't worry if you haven't done this, you can still do it.

31 January – File and Pay Your Tax

The big one!

Your Self Assessment tax return and payment are both due by 31 January following the end of the tax year.

So again just to be clear. Your current deadline is to file and pay before the 31st of January 2026, fo any sales you made between Arpil 6th 2024 and April 5th 2025.

Miss that date, and HMRC may add penalties or interest.

31 July – Second Payment on Account (if applicable)

If you pay tax through Payments on Account, you might have a second instalment due by 31 July each year.This only applies once you’ve been trading for a while and owe more than £1,000 in tax — but it’s worth knowing about early.

Quick reference table:

Date	What Happens	Why It Matters
6 April	New tax year begins	Start tracking new sales and expenses
5 April	Old tax year ends	Last day to record this year’s income
5 October	Register for Self Assessment	Tell HMRC if you earned over £1,000
31 January	File & pay your return	Avoid late fees and interest
31 July	2nd Payment on Account (if due)	Applies if your tax bill is over £1,000

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